Clinical Infection On Shrimp

The virus can also be found in the hemolymph of shrimp that showed clinical symptoms, it is suspected WSSV spread through the circulatory system (Momoyama et al., 1995). Clinical symptoms of infection with WSSV in shrimp body with symptoms of redness can be seen in Figure 6. IHHNV classified in a double-standed DNA and a virus that attacks the smallest sized shrimp. Virion diameter of 22 mm, non-envelope, including in Parvoviridae (Bonami et al., 1990; Bonami & Lightner, 1991; Mari et al., 1993; Nunan et al., 2000; Shike et al., 2000). Figure 5. Clinical symptoms WSSV infection white spots on the carapace

In addition to attacking P. monodon, IHHN virus also attacks Litopenaeus stylirostris and L. vannamei. Brock & Lightner (1990) reported that the shrimp L. stylirostris IHHNV attack in Hawaii and lead to mass mortality (> 90%) at the age of shrimp PL and broodstock. IHHNV is epizootic infection and infectious disease transmission can be through vertical and horizontal, shrimp who have recovered can be a carrier of disease throughout his life (Covarrubias and Chavez-Morales-Sanchez, 1999; Mothe et al., 2003). Figure 6. Clinical symptoms WSSV infection in shrimp body with symptoms of redness

Lightner et al. (1983b) and Bell & Lightner (1984) mentions that IHHNV infection in L. vannamei and P. monodon not cause major loss but causes stunted shrimp / prawn small or known as RDS (runt deformity syndrome). Halini an economic loss where the shrimp are smaller harvest. Flegel (1997), Primavera & Quinito (2000) and Tang et al. (2003) mentions that IHHNV infections in some countries in East Asia and Southeast Asia attack of wild shrimp and shrimp farming, attacks on P. monodon not cause a great loss.

BP’s disease virus (Baculovirus Penaid) can cause, among others: a) The death of high levels of larvae. b) On the enlargement will be subacute or chronic. c) The shrimp were attacked appetite down and slow growth.